After the victory of the Anti-Japanese War, various forces still entrenched in the vast snowfields of the three northeastern provinces, including the vicious bandits of Jiushan Shibagang and some middle forces who could not see the situation clearly and wavered between the Kuomintang and the Communist Party. Yang Jianfeng, the reconnaissance platoon leader of the Northeast Democratic Alliance Army, was assigned to participate in the bandit suppression operation. Under the leadership of Wu Rundong, the political commissar of the Northeast Democratic Alliance Army, Yang Jianfeng risked his life, went deep into the enemy's rear, fought against the enemy bandits, moved the wavering female leader of the Tiger Mountain, Dan Niang, with emotion, reason, and power, and finally thwarted the conspiracy of the Kuomintang reactionaries, making Dan Niang and her subordinates surrender sincerely and jointly eliminate the surrounding Jiushan Shibagang bandits.